XBMC is the one of futuristic media center which available on Ubuntu. It have some useful features, such as; video player, music player, picture viewer, programs, scripts and it can be fetch the weather information if online.
To install it (on Ubuntu 9.10 Karmic Koala with ppa installed)
sudo add-apt-repository ppa:team-xbmc
sudo apt-get update
sudo apt-get install xbmc
XBMC will installed on menu, or just run with “xbmc” command via run or terminal
To add the repos manually (on Ubuntu 9.04 Jaunty Jackalope or below version):
sudo nano /etc/apt/sources.list
and paste the following lines
download the xbmc key on this site, choose your ubuntu version.
sudo apt-key add xbmc-ppa.key
#assume that downloaded key is xbmc-ppa.key